JPH033921Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a lamp installed in an automobile or the like, and specifically relates to an illumination lamp such as a headlamp.

〓Conventional technology〓 This type of vehicle lighting device by Jura, for example,
There is a device disclosed in Japanese Patent No. 58-103701, in which a spheroidal or triaxial ellipsoid is used as a reflecting mirror, the filament of a light bulb is arranged near the first focal point of this reflecting mirror, and the filament of a light bulb is arranged near the second focal point of the reflecting mirror. By providing a mask plate having a shape suitable for the light distribution of the passing beam, and further arranging an imaging lens that projects the shape of the mask plate at a position beyond the second focal point, the light distribution characteristics of the passing beam can be adjusted. This is what you get.

Problems to be Solved by the Invention However, in the conventional vehicle lamp described above, the light distribution characteristics are determined by the magnifications of the reflecting mirror and the imaging lens, and there is little freedom in designing the light distribution characteristics. In addition, the illuminance tends to be flat over the entire light distribution characteristic, and this type of light distribution pattern generally requires a high illuminance band for illuminating distant areas and a high illuminance band for illuminating the peripheral area. This poses a problem in that it is difficult to obtain a wide range of diffused light.

〓Means for Solving the Problems〓 The present invention is a specific means for solving the above-mentioned conventional problems.In a vehicle lamp having a light source and a reflecting mirror, the reflecting mirror is a spheroidal reflecting mirror. and a paraboloid of revolution reflector, and the paraboloid of revolution reflector is centered on the optical axis and has a focal point near the rear end of the filament. and a lower paraboloid of revolution reflector set near the front end, and a mask plate that determines light distribution characteristics is provided between the ellipsoid of revolution reflector and the second focal point of the nuclear reflector, and the mask plate By providing a vehicle lamp characterized in that an imaging lens for projecting a nuclear mask plate is provided at a position beyond the nuclear mask plate, the problems that occur in the conventional vehicle lamps are solved. .

Embodiment Next, the present invention will be described in detail based on an embodiment of the vehicle lamp 1 shown in FIGS. 1, 2, and 3.

Figure 1 shows a reflector 2 of a vehicle lamp 1 according to the present invention.
This is shown in a front view, and this reflecting mirror 2 has a central part with a focal point near the center of the filament 3, which is close to the left and right ends of the spheroidal reflecting mirror 2a, and a focal point at or near the rear end of the filament 3. An upper paraboloid of revolution reflector 2b is disposed in the upper half, and a lower paraboloid of revolution 2c is disposed in the lower half and has a focal point at or near the front end of the filament 3. There is.

FIG. 2 shows the portion of the spheroidal reflecting mirror 2a in more detail. This reflecting mirror 2a is formed into a spheroidal surface as explained above, so that the first focal point Fa and the second focal point It has two focal points Fd,
By locating one first focal point Fa approximately at the center of the filament 3, an optical image 3a of the filament 3 is formed at the other second focal point Fd. An imaging lens 4 formed of a convex lens is disposed further in front of the second focal point Fd, a mask plate 5 is disposed near the focal point of the nucleus imaging lens, and the mask plate is arranged in the ellipsoid of revolution. The pattern of the projected light can be selected by arbitrarily disposing it between the surface reflecting mirror 2a and the second focal point Fd of the ellipsoid of revolution.

Here, the imaging lens 4 simultaneously projects the shape of the mask plate 5, and therefore, by appropriately forming the shape of the mask plate 5, a shape with a desired light distribution characteristic can be obtained. In addition, the filament 3
A focal point Fb of the upper parabolic reflecting mirror 2b is provided at or near the rear end, and a focal point Fc of the lower parabolic reflecting mirror 2c is similarly provided at or near the front end.

The symbol A in FIG. 3 indicates the shape of the light distribution characteristic due to the spheroidal reflecting mirror 2a, the imaging lens and the mask plate 5, and is particularly important as a light distribution for passing beams. A1−A2−A3
The boundary line leading to is formed by the shape of the mask plate 5 being projected by the imaging lens 4, and is extremely clear. Incidentally, in order to exhibit the above effect, the front lens 6 at a position corresponding to the imaging lens 4 has a planar shape without a lens cut.

FIG. 4 shows the action of the upper paraboloid of revolution reflector 2b and the lower paraboloid of revolution reflector 2c, in which the upper paraboloid of revolution reflector 2b focuses the focal point Fb on the rear end of the filament 3. holding the lower rotating parabolic reflector 2
Since c has a focal point Fc at the front end of the filament 3, each of the reflecting mirrors 2b and 2c produces downward irradiation light, and the positions of the light distribution characteristics B and C in FIG. The light beams are projected onto the mirrors 2b and 2c, respectively, and are further moderately diffused in the directions shown by arrows in the figure by means such as known lens cuts 6a applied to the lenses 6 at positions corresponding to the reflecting mirrors 2b and 2c. It is considered to have suitable light distribution characteristics.

Note that the part that is the paraboloid of revolution reflector is designated by the reference numeral 2.
It is also possible to make only the part b or only the part 2c, or make the parts 2b and 2c the same paraboloid of revolution, set the focal point near the center of the filament 3, and rotate. It is also possible to have a structure in which the axis of the paraboloid is directed downward.

= Effect of the invention = As established above, according to the invention, the reflecting mirror is a composite reflecting mirror including a spheroidal reflecting mirror, and is arranged between the spheroidal reflecting mirror and the second focal point of the spheroidal surface. A mask plate for determining optical characteristics is provided, an imaging lens for projecting the mask plate is provided at a position beyond the second focal point, and a front lens is further provided at a position beyond the imaging lens, and the front lens The lens is cut to control the reflected light from a reflector other than the spheroidal surface, making it possible to freely set the light distribution characteristics and providing a good sharpness, which has an outstanding effect on improving the performance of this type of vehicle lamp. It is something that plays.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a reflector of an embodiment of a vehicle lamp according to the present invention, FIG. 2 is a side sectional view of the embodiment, FIG. 3 is an explanatory diagram similarly showing light distribution characteristics, and FIG.
The figure is also a plan sectional view, and FIG. 5 is a sectional view showing a conventional example. 1... Vehicle lamp, 2... Reflector, 2a... Ellipsoid of revolution reflector, 2b... Upper paraboloid of revolution reflector,
2c...Lower rotating parabolic reflector, 3...Filament, 3a...Light image, 4...Imaging lens, 5...Mask plate, 6...Front lens, 6a...Lens cut, Fa~Fd... focus.

Claims (1)

[Scope of claims for utility model registration] (1) In a vehicle lamp that includes a light source and a reflector,
The reflecting mirror has a composite reflecting surface of an ellipsoid of revolution reflector and a paraboloid of revolution reflector, and the paraboloid of revolution reflector is an upper paraboloid of revolution whose focal point is set near the rear end of the filament with the optical axis as the center. The reflector is divided into a surface reflector and a lower paraboloid reflector whose focal point is set near the front end of the filament, and a light distribution characteristic is defined between the ellipsoid of revolution reflector and the second focus of the nuclear reflector. A vehicle lamp characterized in that a mask plate is provided and an imaging lens for projecting the nuclear mask plate is provided at a position beyond the mask plate. (2) A request for registration of a utility model characterized in that a front lens is provided at a position beyond the imaging lens, and the front lens is provided with a lens cut for giving predetermined light distribution characteristics to the projected light. Vehicle lights described in scope (1).